Every patient — from coping to hoping. Every donor or volunteer — from altruism to inspiration. These stories inspire our work and compel mission advocates to give financially, join the registry, volunteer or spread the word.
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A marrow transplant may be someone’s only hope for a cure. Learn how marrow donation works, the steps of a patient transplant, steps of donation, and factors that can impact the likelihood of finding a match.
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Be The Match® is a global leader in bone marrow transplantation. We conduct research to improve transplant outcomes provide support and resources for patients, and partner with a global network.
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Weight guidelines when you match a patient

Bone marrow donation medical guidelines include an assessment of body mass index (BMI) and height to weight ratio. There is not a minimum weight requirement. However, there are maximum weight guidelines for joining the registry and for donating marrow. These guidelines have been established to help ensure your safety as a donor.

If you are called to donate, you will undergo a physical exam and will be assessed for any weight-related health issues that might impact your ability to donate.

To see the maximum weight (in pounds) for a given height (in feet and inches), please see the chart below:

Height and weight guidelines for donors identified as a possible match